#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>

int main() {
    int a;
    while (scanf("%d", &a) != EOF) {
        for (int i = 0;i < a;i++)
        {
            for (int j = 0;j < a;j++)
            {
                if (i == 0 || i == a-1)
                    printf("* ");
                else if (j == 0 || j == a-1 )
                    printf("* ");
                else
                    printf("  ");
            }
            printf("\n");
         }
    }
    return 0;
}